Common positive bus multiplexing motor winding inductance boosting and current rising heating system and electric automobile

Abstract

The invention relates to the technical field of new energy automobiles, in particular to a common positive bus multiplexing motor winding inductance boosting and current increasing heating system which comprises a power battery, a charging port, a driving system and a switch assembly. The power battery is provided with a self-heating loop, and positive and negative electrodes are connected with the charging port through a positive bus and a negative bus respectively to realize a battery self-heating mode; the driving system comprises a motor and a motor controller arranged between a positive bus and a negative bus, and the motor is provided with a three-phase winding inductor which is respectively connected to different transistors of the motor controller. The switch assembly is connected with two-phase winding inductors of the motor in parallel, one-phase winding inductors are connected in series, and the switch assembly comprises a plurality of switches arranged on positive and negative buses and is used for controlling the motor inductor to be connected with at least one of the negative electrode of the power battery, the negative electrode of the charging port or the positive bus, and the motor inductor is reused to achieve a direct fast charging mode, a boost charging mode or an up-current charging mode. Therefore, the problem that the electric vehicle is difficult to be compatible with charging piles of different voltage grades is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, in particular to a common positive bus multiplex motor winding inductance step-up and step-up heating system and an electric vehicle. BACKGROUND

[0002] With the wide promotion of electric vehicles, the adaptation ability of vehicles to different types of charging infrastructure becomes particularly important. To cope with this trend, the related technology adopts a high-voltage electrical architecture as shown in FIG. 1, which includes a main positive relay K2, a main negative relay K4, a pre-charging relay K3, fast-charging relays K6 and K7, a pre-charging resistor R1, power devices Q1-Q6, and a bus capacitor C1. Figure 1

[0003] However, the voltage level of a direct current charging pile is 500V, 750V, or 1000V. When the voltage platform of the power battery of an electric vehicle is in the 500-750V or 750-1000V interval, a low-voltage charging pile cannot charge a high-voltage vehicle, or when a high-voltage pile charges a low-voltage vehicle, the limited charging interface limits the maximum charging current. SUMMARY

[0004] The present application provides a common positive bus multiplex motor winding inductance step-up and step-up heating system and an electric vehicle to solve the problem that electric vehicles are difficult to be compatible with different voltage level charging piles.

[0005] The first aspect of the present application provides a common positive bus multiplex motor winding inductance step-up and step-up heating system, comprising a power battery, a charging port, a driving system, and a switch assembly; the power battery is provided with a self-heating loop, a positive bus is arranged between the positive electrode of the power battery and the positive electrode of the charging port, a negative bus is arranged between the negative electrode of the power battery and the negative electrode of the charging port, and the self-heating loop is used to realize the battery self-heating mode; the driving system comprises a motor controller and a motor, the motor controller is arranged between the positive bus and the negative bus, the motor comprises three-phase winding inductance, and the three-phase winding inductance of the motor is connected with different transistors of the motor controller; the switch assembly is connected in parallel with two-phase winding inductance and in series with one-phase winding inductance of the motor, the switch assembly comprises a plurality of switches, the plurality of switches are arranged on the positive bus and the negative bus, the inductance of the motor is controlled to be connected to at least one of the negative electrode of the power motor, the negative electrode of the charging port, and the positive bus, and the inductance of the multiplex motor realizes at least one mode of a direct fast-charging mode, a step-up charging mode, and a step-up current charging mode.

[0006] Optionally, in an embodiment of the present application, the motor controller and the motor perform pulse charging and discharging on the power battery, and the self-heating of the power battery is realized by using pulse current.

[0007] ​Optionally, in an embodiment of the present application, the switch assembly comprises the first to ninth switches, the resistor, the first capacitor and the second capacitor, wherein the second switch and the sixth switch are arranged on the positive bus, the fourth switch and the seventh switch are arranged on the negative bus, the positive pole of the power battery is connected with one end of the second switch and one end of the third switch respectively, the other end of the third switch is connected with one end of the resistor, the other end of the second switch is connected with the other end of the resistor, the positive pole of the first capacitor, the positive pole of the second capacitor and one end of the sixth switch respectively, the other end of the sixth switch is connected with the positive pole of the charging port, the negative pole of the power battery is connected with one end of the first switch and one end of the fourth switch respectively, the other end of the first switch is connected with one end of the eighth switch and the negative pole of the second capacitor respectively, the other end of the fourth switch is connected with the negative pole of the first capacitor and one end of the seventh switch respectively, the other end of the seventh switch is connected with the negative pole of the charging port, one end of the fifth switch is connected with one phase winding inductance of the motor, the other end of the fifth switch is connected with the negative pole of the second capacitor, the other end of the first switch and one end of the ninth switch respectively, the other end of the ninth switch is connected with the negative pole of the charging port.

[0008] Optionally, in an embodiment of the present application, the second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed, the first switch, the fifth switch, the eighth switch and the ninth switch are opened, and the power battery enters the direct current fast charging mode; the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the ninth switch are closed, the first switch, the seventh switch and the eighth switch are opened, and the power battery enters the boost charging mode; the first switch, the second switch, the third switch, the fifth switch, the sixth switch and the seventh switch are closed, the fourth switch, the eighth switch and the ninth switch are opened, and the power battery enters the current boost charging mode; the second switch, the third switch, the fourth switch and the eighth switch are closed, the first switch, the fifth switch, the sixth switch, the seventh switch and the ninth switch are opened, and the power battery enters the battery heating mode.

[0009] Optionally, in an embodiment of the present application, the switch assembly comprises the first to ninth switches, the resistor, the first capacitor and the second capacitor, wherein, The positive bus is provided with a second switch and a sixth switch, and the negative bus is provided with a fourth switch and a seventh switch. The positive pole of the power battery is connected with one end of the second switch and one end of the third switch. The other end of the third switch is connected with one end of the resistor. The other end of the second switch is connected with the other end of the resistor, one end of the fifth switch and one end of the sixth switch. The other end of the fifth switch is connected with the positive pole of the second capacitor. The other end of the sixth switch is connected with the positive pole of the charging port. The negative pole of the power battery is connected with one phase winding inductance of the motor, one end of the first switch and one end of the fourth switch. The other end of the first switch is connected with one end of the eighth switch, one end of the ninth switch and the negative pole of the second capacitor. The other end of the ninth switch is connected with the negative pole of the charging port. The other end of the fourth switch is connected with the negative pole of the first capacitor and one end of the seventh switch. The other end of the seventh switch is connected with the negative pole of the charging port.

[0010] Optionally, in an embodiment of the present application, the second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed, the first switch, the fifth switch, the eighth switch and the ninth switch are opened, and the power battery enters the direct current fast charging mode. The second switch, the third switch, the fourth switch, the sixth switch and the ninth switch are closed, the first switch, the fifth switch, the seventh switch and the eighth switch are opened, and the power battery enters the boost charging mode. The first switch, the second switch, the third switch, the fifth switch, the sixth switch and the seventh switch are closed, the fourth switch, the eighth switch and the ninth switch are opened, and the power battery enters the current boost charging mode. The second switch, the third switch, the fourth switch and the eighth switch are closed, the first switch, the fifth switch, the sixth switch, the seventh switch and the ninth switch are opened, and the power battery enters the battery heating mode.

[0011] Optionally, in an embodiment of the present application, one end of the self-heating loop is connected with the middle interface of the power battery, the other end of the self-heating loop is connected with the other end of the first switch, and the eighth switch is arranged on the self-heating loop.

[0012] Optionally, in an embodiment of the present application, the first to ninth switches are relays.

[0013] The second aspect embodiment of the present application provides an electric vehicle, which comprises the common positive bus multiplexing motor winding inductance boost current boost heating system.

[0014] Therefore, the present application has at least the following beneficial effects: The application provides a system comprising a power battery, a charging port, a driving system and a switch assembly, wherein the power battery is provided with a self-heating circuit, and the positive and negative electrodes are connected with the charging port through a positive bus and a negative bus respectively, so as to realize a battery self-heating mode; the driving system comprises a motor and a motor controller arranged between the positive and negative buses, the motor has three-phase winding inductances connected to different transistors of the motor controller respectively; the switch assembly is connected in parallel with two-phase winding inductances of the motor and in series with one-phase winding inductance, and comprises a plurality of switches arranged on the positive and negative buses, so as to control the motor inductance to be connected with at least one of the negative electrode of the power battery, the negative electrode of the charging port or the positive bus, and the motor inductance is multiplexed to realize a direct fast charging mode, a step-up charging mode or a step-up current charging mode. Thus, the problem that an electric vehicle is difficult to be compatible with different voltage level charging piles is solved.

[0015] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which: Figure 1 High-voltage architecture diagram of related art electric vehicle; Figure 2 Common positive bus multiplexing motor winding inductance step-up and step-up current heating system provided by the embodiment of the application; Figure 3 Charging architecture schematic diagram of electric vehicle provided by the embodiment of the application; Figure 4 Charging architecture structure improvement schematic diagram of electric vehicle provided by the embodiment of the application; Figure 5 Direct fast charging mode circuit diagram provided by the embodiment of the application; Figure 6 Direct fast charging mode working mode schematic diagram provided by the embodiment of the application; Figure 7 Step-up charging mode main circuit diagram provided by the embodiment of the application; Figure 8 Step-up charging mode voltage conversion schematic diagram provided by the embodiment of the application; Figure 9 Ground voltage conversion schematic diagram provided by the embodiment of the application; Figure 10 Step-up charging mode energy storage schematic diagram provided by the embodiment of the application; Figure 11 Step-up charging mode voltage improvement schematic diagram provided by the embodiment of the application; Figure 12 A boost charging mode main circuit diagram is provided according to an embodiment of the present application; Figure 13 A boost charging mode energy storage diagram is provided according to an embodiment of the present application; Figure 14 A boost charging mode current boosting diagram is provided according to an embodiment of the present application; Figure 15 A battery heating mode main circuit diagram is provided according to an embodiment of the present application; Figure 16 A battery heating mode upper half module charging motor inductance working diagram is provided according to an embodiment of the present application; Figure 17 A battery heating mode motor inductance discharging to lower half module working diagram is provided according to an embodiment of the present application; Figure 18 A battery heating mode lower half module charging motor inductance working diagram is provided according to an embodiment of the present application; Figure 19 A battery heating mode motor inductance discharging to upper half module working diagram is provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0017] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0018] The common positive bus multiplex motor winding inductance boost and current heating system and electric vehicle of the embodiments of the present application are described below with reference to the accompanying drawings. In view of the problems mentioned in the above background art, the present application provides a common positive bus multiplex motor winding inductance boost and current heating system, in which the present application provides a system comprising a power battery, a charging port, a driving system and a switch assembly, wherein the power battery is provided with a self-heating loop, and the positive and negative electrodes are connected with the charging port through the positive bus and the negative bus respectively, for realizing the battery self-heating mode; the driving system comprises a motor and a motor controller arranged between the positive and negative buses, and the motor has three-phase winding inductance connected to different transistors of the motor controller; the switch assembly is connected in parallel with two-phase winding inductance and in series with one-phase winding inductance of the motor, and comprises a plurality of switches arranged on the positive and negative buses, for controlling the connection of the motor inductance with at least one of the negative electrode of the power battery, the negative electrode of the charging port or the positive bus, and multiplexing the motor inductance to realize direct fast charging, boost charging or boost current charging mode. Thus, the problem that the electric vehicle is difficult to be compatible with different voltage level charging piles and the like is solved.

[0019] Specifically,Figure 2 A block diagram of a common positive bus multiplex motor winding inductance step-up and current-up heating system provided by an embodiment of the present application.

[0020] As shown in the figure, the common positive bus multiplex motor winding inductance step-up and current-up heating system includes a power battery 100, a charging port 300, a driving system 300, and a switch assembly 400. Figure 2 The power battery 100 is provided with a self-heating circuit, a positive bus is arranged between the positive electrode of the power battery 100 and the positive electrode of the charging port 300, a negative bus is arranged between the negative electrode of the power battery 100 and the negative electrode of the charging port 300, and the self-heating circuit is used to realize the battery self-heating mode; the driving system 300 includes a motor controller and a motor, the motor controller is arranged between the positive bus and the negative bus, the motor includes three-phase winding inductance, and the three-phase winding inductance of the motor is connected with different transistors of the motor controller; the switch assembly 400 is connected in parallel with two-phase winding inductance of the motor and in series with one-phase winding inductance, the switch assembly 400 includes a plurality of switches, and the plurality of switches are arranged on the positive bus and the negative bus, the inductance of the motor is controlled to be connected to at least one of the negative electrode of the power motor, the negative electrode of the charging port 300, and the positive bus, and the inductance of the multiplex motor realizes at least one mode of the direct fast charging mode, the step-up charging mode, and the current-up charging mode.

[0021] The power battery 100 is used as the main energy storage part of the electric vehicle to provide power for the vehicle operation. The self-heating circuit is an electric heating path for improving the temperature of the power battery 100 in a low-temperature environment, which usually makes the battery itself or other devices in the system heat through the control circuit to improve the working efficiency and safety of the battery. The driving system 300 is not only used to regulate the running state of the motor, but also has multiple functions of step-up of the charging voltage, current-up of the charging current, and heating of the power battery 100. The motor is an actuator for providing driving force for the vehicle. The motor controller is an electronic control unit for controlling the running state of the motor, which controls the motor output by adjusting the voltage, current, and switching frequency to realize functions such as acceleration, deceleration, and energy feedback. The three-phase winding inductance is the three independent windings inside the motor corresponding to the three-phase electric input of the motor, and the inductance characteristics of the winding can be used to store energy or adjust the current waveform. The charging port 300 is a connection interface between the vehicle and external charging facilities, which is used to introduce external charging current. The multiplex motor inductance is used for other functions in the non-driving state to improve the system efficiency and reduce the cost.

[0022] In an embodiment of the present application, the motor controller and the motor perform pulse charging and discharging on the power battery 100, and the self-heating of the power battery 100 is realized by using pulse current.

[0023]

[0024] ​The pulse charging and discharging is a way of periodically charging and discharging the battery for a short time to form a current pulse. In the embodiment of the application, the power battery 100 is heated by the pulse current to generate Joule heat in the battery, thereby increasing the temperature of the battery cell and improving the working activity in a low temperature environment. The pulse current is a current signal with periodic on-off or alternating current waveform, which has the characteristics of high instantaneous amplitude and short duration. In the self-heating mode, the pulse current forms a short-term energy fluctuation through the power battery 100, thereby increasing the temperature of the power battery 100 and achieving rapid heating.

[0025] It can be understood that the motor controller cooperates with the motor to perform pulse charging and discharging on the power battery 100, and the Joule heat generated by the pulse current is used to realize self-heating of the battery. The temperature of the battery can be quickly increased in a low temperature environment, and the performance bottlenecks such as large internal resistance and low reaction rate of the battery can be improved, thereby improving the activity and charging response capability of the battery. In one embodiment of the application, as shown in Figure 3 The switch assembly 400 includes first to ninth switches K1-K9, a resistor R1, a first capacitor C1 and a second capacitor C2. The second switch K2 and the sixth switch K6 are arranged on the positive bus, and the fourth switch K4 and the seventh switch K7 are arranged on the negative bus. The positive electrode of the power battery 100 is connected to one end of the second switch K2 and one end of the third switch K3. The other end of the third switch K3 is connected to one end of the resistor R1. The other end of the second switch K2 is connected to the other end of the resistor R1, the positive electrode of the first capacitor C1, the positive electrode of the second capacitor C2 and one end of the sixth switch K6. The other end of the sixth switch K6 is connected to the positive electrode of the charging port 300. The negative electrode of the power battery 100 is connected to one end of the first switch K1 and one end of the fourth switch K4. The other end of the first switch K1 is connected to one end of the eighth switch K8 and the negative electrode of the second capacitor C2. The other end of the fourth switch K4 is connected to the negative electrode of the first capacitor C1 and one end of the seventh switch K7. The other end of the seventh switch K7 is connected to the negative electrode of the charging port 300. One end of the fifth switch K5 is connected to one phase winding inductance of the motor. The other end of the fifth switch K5 is connected to the negative electrode of the second capacitor C2, the other end of the first switch K1 and one end of the ninth switch K9. The other end of the ninth switch K9 is connected to the negative electrode of the charging port 300.

[0026] It can be understood that the embodiment of the application realizes flexible switching of the paths between the power battery 100, the motor inductance and the charging port 300 through reasonable connection design, thereby supporting multiple working modes, realizing reuse of the motor inductance, and reducing hardware redundancy.

[0027] In Figure 3In the system structure shown, the charging filter capacitor C2 is directly connected in series between the fast charging interface and the power battery 100, and forms a filter branch in series with the fifth switch K5, and the conduction state of the filter branch is controlled by the fifth switch K5. In this configuration, K5 needs to carry the rated charging current of the system during conduction, which is equivalent to being directly in the main circuit, so it needs to have high current carrying capacity, voltage resistance and sufficient device capacity to cope with high amplitude impact load in the main current path.

[0028] Based on the system structure shown below, Figure 3 In an embodiment of the present application, the second switch K2, the third switch K3, the fourth switch K4, the sixth switch K6 and the seventh switch K7 are closed, the first switch K1, the fifth switch K5, the eighth switch K8 and the ninth switch K9 are opened, and the power battery 100 enters the direct current fast charging mode; the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6 and the ninth switch K9 are closed, the first switch K1, the seventh switch K7 and the eighth switch K8 are opened, and the power battery 100 enters the boost charging mode; the first switch K1, the second switch K2, the third switch K3, the fifth switch K5, the sixth switch K6 and the seventh switch K7 are closed, the fourth switch K4, the eighth switch K8 and the ninth switch K9 are opened, and the power battery 100 enters the boost charging mode; the second switch K2, the third switch K3, the fourth switch K4 and the eighth switch K8 are closed, the first switch K1, the fifth switch K5, the sixth switch K6, the seventh switch K7 and the ninth switch K9 are opened, and the power battery 100 enters the battery heating mode.

[0029] Specifically, when the system works in the direct fast charging mode, the system main circuit is as shown in Figure 5 The switches K2, K3, K4, K6 and K7 are closed, and the switches K1, K5, K8 and K9 are opened. The specific process is as shown in Figure 6 At this time, the external charging pile directly charges the power battery 100.

[0030] When the system works in the boost charging mode, the system main circuit is as shown in Figure 7 The switches K2, K3, K4, K5, K9 and K6 are closed, and the switches K1, K6 and K8 are opened. After starting charging, since the charging initiation stage, the charging needs to detect the voltage platform of the vehicle, therefore, during the charging start stage, the system is in the step-down mode, charges the capacitor C2, and provides a voltage that the charging pile can accept. The specific steps are as shown in Figure 8 , Figure 9As shown, by controlling the switching state of power devices Q4, Q6, the voltage of the high-voltage battery pack is converted into low voltage, and the motor inductance is used for energy storage and release, and the voltage of the capacitor is maintained as the ground voltage acceptable by the charging pile. As shown Figure 10 As shown, the power devices Q3, Q5 are closed, and the charging pile stores energy for the motor inductance. After the energy storage is completed, as shown Figure 11 As shown, the power devices Q3, Q5 are closed, and the charging pile stores energy for the motor inductance. After the energy storage is completed, as shown

[0031] When the system works in the boost charging mode, the main circuit of the system is as shown Figure 12 As shown, in the starting stage, the voltage of the capacitor C2 is charged to be close to the voltage of the battery pack by using the steps as shown Figure 8 , Figure 9 After the voltage of the capacitor C2 is charged to be close to the voltage of the battery pack, the switches K1, K2, K3, K5, K6, and K7 are closed, and the switches K4, K8, and K9 are opened. The inductor of the system is a configurable energy storage device, and according to the actual effect, the inductor can be cancelled. After the charging starts, as shown Figure 13 As shown, the power devices Q4 and Q6 are turned on, and the charging pile stores energy for the motor inductance. After the energy storage is completed, as shown Figure 14 As shown, the power devices Q4 and Q6 are closed, and the charging pile stores energy for the motor inductance. After the energy storage is completed, as shown

[0032] When the system works in the battery heating mode, the main circuit of the system is as shown Figure 15 As shown, the switches K2, K3, K4, and K8 are closed, and the switches K1, K5, K6, K7, and K9 are opened. The inductor of the system is a configurable energy storage device, and according to the actual effect, the inductor can be cancelled. After the charging starts, as shown Figure 16 As shown, the power devices Q3 and Q5 are turned on, and the upper half module battery stores energy for the motor inductance. After the energy storage is completed, as shown Figure 17 As shown, the power devices Q3 and Q5 are closed, and the motor inductance stores energy for the lower half module battery, and the energy is formed into a loop through the power devices Q4 and Q6 and diodes. Then, as shown Figure 18 and Figure 19 As shown, the power devices Q4 and Q6 are turned on, and the lower half module battery stores energy for the motor and inductance. After the energy storage is completed, the power devices Q4 and Q6 are closed, and the energy stored in the motor inductance is used to charge the upper half module battery through the power devices Q3 and Q5. By controlling the frequency and duty cycle of turning on, the self-heating function of the pulse battery is realized.

[0033] In an embodiment of the present application, as shown Figure 4As shown, the switch assembly 400 includes first to ninth switches K1-K9, a resistor R1, a first capacitor C1 and a second capacitor C2, wherein the second switch K2 and the sixth switch K6 are arranged on the positive bus, the fourth switch K4 and the seventh switch K7 are arranged on the negative bus, the positive pole of the power battery 100 is connected with one end of the second switch K2 and one end of the third switch K3, respectively, the other end of the third switch K3 is connected with one end of the resistor R1, the other end of the second switch K2 is connected with the other end of the resistor R1, one end of the fifth switch K5 and one end of the sixth switch K6, respectively, the other end of the fifth switch K5 is connected with the positive pole of the second capacitor C2, the other end of the sixth switch K6 is connected with the positive pole of the charging port 300, the negative pole of the power battery 100 is connected with one phase winding inductance of the motor, one end of the first switch K1 and one end of the fourth switch K4, respectively, the other end of the first switch K1 is connected with one end of the eighth switch K8, one end of the ninth switch K9 and the negative pole of the second capacitor C2, respectively, the other end of the ninth switch K9 is connected with the negative pole of the charging port 300, the other end of the fourth switch K4 is connected with the negative pole of the first capacitor C1 and one end of the seventh switch K7, respectively, the other end of the seventh switch K7 is connected with the negative pole of the charging port 300.

[0034] It can be understood that the embodiments of the present application not only can reuse the motor inductance and capacitor devices to improve the system integration, but also can effectively suppress the ripple in the charging process through the cooperation of switches, resistors and capacitors to improve the system stability and safety. The ripple is an alternating component mixed in the direct current voltage or current, which is a small fluctuation in the voltage or current.

[0035] The embodiments of the present application improve the system integration, realize efficient reuse of motor inductance and capacitor devices, and reduce hardware redundancy. In addition, by reasonably configuring the cooperative work of switches, resistors and capacitors, the current ripple in the charging process is effectively suppressed, and the stability and safety of system operation are enhanced. The ripple is a periodic alternating component superimposed in the direct current voltage or current, wherein the ripple is an alternating component mixed in the direct current voltage or current, which is a small fluctuation in the voltage or current.

[0036] Specifically, Figure 3 Although the system structure shown in the figure is simple and direct for filtering path, which is easy to implement, but also increases the burden of devices. In order to reduce the burden of devices and optimize the overall performance, the present application designs a filter path as shown in the following figure. Figure 4The topology is shown. Without altering the function of the charging filter capacitor C2 and the entire charging path, the connection point of the fifth switch K5 is moved from the battery side to the motor side, creating a current shunt structure. This ensures that when the fifth switch K5 is turned on, only ripple current flows through it, significantly reducing the current it needs to withstand during switching. In this configuration, the fifth switch K5 no longer undertakes the task of switching the main circuit on and off, but only serves as an auxiliary switching switch, connecting the filter capacitor. This allows for the selection of devices with smaller capacitance and faster response speeds.

[0037] Based on the above embodiments, the following will be based on Figure 4 Based on the system structure shown, the entry methods of direct fast charging mode, boost charging mode, boost current charging mode, and battery self-heating mode are described. In one embodiment of this application, the second switch K2, the third switch K3, the fourth switch K4, the sixth switch K6, and the seventh switch K7 are closed, and the first switch K1, the fifth switch K5, the eighth switch K8, and the ninth switch K9 are open, and the power battery 100 enters DC fast charging mode; the second switch K2, the third switch K3, the fourth switch K4, the sixth switch K6, and the ninth switch K9 .... When switches K7 and K8 are open, the power battery 100 enters the boost charging mode; when switches K1, K2, K3, K5, K6, and K7 are closed, and switches K4, K8, and K9 are open, the power battery 100 enters the current charging mode; when switches K2, K3, K4, and K8 are closed, and switches K1, K5, K6, K7, and K9 are open, the power battery 100 enters the battery heating mode.

[0038] The methods for entering DC fast charging mode, boost charging mode, and battery heating mode are the same as those mentioned above. Figure 3 The system structure switching process shown is consistent, but the entry method for the boost charging mode is slightly different. The following uses the boost charging mode of this application embodiment as an example to illustrate its specific switching control method and energy conversion process.

[0039] When the system works in the boost charging mode, the switches K2, K3, K4, K6 and K9 are closed, and the switches K1, K5, K7 and K8 are opened. After starting charging, the charging needs to detect the voltage platform of the vehicle in the charging start stage, so the system is in the buck mode in the charging start stage, the capacitor C2 is charged to provide a voltage that the charging pile can accept, the voltage of the high-voltage battery pack is converted into low-voltage by controlling the switching state of the power devices Q4 and Q6, and the voltage of the capacitor is maintained as the ground voltage that the charging pile can accept by using the motor, the inductor energy storage and release. The power devices Q3 and Q5 are turned on, and the charging pile stores energy in the motor and the inductor. After the energy storage is completed, the power devices Q3 and Q5 are turned off, and the energy of the inductor and the charging pile is superimposed to charge the power battery 100 through the power devices Q4 and Q6, so as to realize the boost of the charging voltage.

[0040] In an embodiment of the present application, one end of the self-heating circuit is connected to the middle interface of the power battery 100, the other end of the self-heating circuit is connected to the other end of the first switch K1, and the eighth switch K8 is arranged on the self-heating circuit.

[0041] The self-heating circuit is a circuit structure for heating the battery in a cold environment by using the power of the power battery 100 itself, and making the internal current of the battery flow back through the internal resistance element or the control device.

[0042] It can be understood that the eighth switch K8 is introduced into the self-heating circuit, so that the self-heating path can be accurately controlled, and since the self-heating circuit is connected to the middle interface of the power battery 100, the voltage can be evenly distributed.

[0043] In an embodiment of the present application, the first to ninth switches K1-K9 are relays.

[0044] The relay is an electrical control device that realizes the automatic switching of the circuit based on the electromagnetic principle.

[0045] It can be understood that, by the orderly combination and control of the first to ninth switches K1-K9, the embodiments of the present application construct an adjustable multi-mode switching circuit among the power battery 100, the capacitor, the resistor and the charging port 300 according to different operation requirements of the system, thereby supporting flexible operation of the system in multiple working modes. In the battery self-heating mode, the resistor serves as a heat source element to generate heat under the excitation of the current, which is used for rapidly heating the battery and effectively improving the activity and charging response capability of the battery in a low-temperature environment. In the boost or boost current charging mode, the current path passes through the motor controller, the motor and the series inductance to construct an energy regulation loop, and the inductance plays a role in energy storage and filtering in this process, which helps to improve the output voltage, suppress the current fluctuation, thereby improving the energy transmission efficiency and enhancing the dynamic adaptability of the system. The motor controller realizes the conversion between direct current and alternating current, ensuring efficient cooperation and stable operation of the motor driving and the charging process.

[0046] According to the common positive bus multiplexing motor winding inductance boost and flow heating system provided by the embodiments of the present application, the system includes a power battery, a charging port, a driving system and a switch assembly, wherein the power battery is provided with a self-heating loop, the positive and negative electrodes are connected with the charging port through the positive bus and the negative bus respectively, and the self-heating mode of the battery is realized; the driving system includes a motor and a motor controller arranged between the positive and negative buses, the motor has three-phase winding inductances connected to different transistors of the motor controller; the switch assembly is connected in parallel with two-phase winding inductances of the motor and in series with one-phase winding inductance, and includes a plurality of switches arranged on the positive and negative buses, which are used to control the connection of the motor inductance with at least one of the negative electrode of the power battery, the negative electrode of the charging port or the positive bus, and the motor inductance is multiplexed to realize the direct fast charging, boost charging or flow charging mode. Thus, the problem that the electric vehicle is difficult to be compatible with different voltage level charging piles is solved.

[0047] The embodiments of the present application also provide an electric vehicle including the common positive bus multiplexing motor winding inductance boost and flow heating system.

[0048] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0049] Furthermore, the terms "first", "second", etc. are used herein only to describe different steps in the process and are not intended to imply or imply relative importance or identify the indicated technical features. Thus, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] Any process or method descriptions or descriptions of the flow diagrams described herein or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing the specified logic functions or processes. The scope of preferred embodiments of the present application includes other implementations that can not be explicitly described above, where the steps of the processes can be performed in an order different from that shown or discussed, including substantially concurrently or in reverse order, as appropriate, to the functionality involved, as would be understood by a person skilled in the art.

[0051] It should be understood that parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As in another embodiment, if implemented in hardware, any of the following technologies known in the art or their combinations can be used: discrete logic circuit with logic gates for implementing logic functions on data signals, application specific integrated circuit with suitable combination logic gates, programmable gate array, field programmable gate array, etc.

[0052] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. The program, when executed, includes one or a combination of the steps of the method embodiments.

Claims

1. A common positive bus multiplexed motor winding inductance step-up step-up current heating system, characterized in that, The application relates to a power battery, a charging port, a driving system and a switch assembly. The power battery is provided with a self-heating circuit, a positive bus is arranged between the positive pole of the power battery and the positive pole of the charging port, and a negative bus is arranged between the negative pole of the power battery and the negative pole of the charging port, so that the self-heating circuit realizes a battery self-heating mode. The driving system comprises a motor controller and a motor, the motor controller is arranged between the positive bus and the negative bus, the motor comprises three-phase winding inductance, and the three-phase winding inductance of the motor is connected with different transistors of the motor controller. The switch assembly is connected in parallel with two-phase winding inductance of the motor and in series with one-phase winding inductance, the switch assembly comprises a plurality of switches arranged on the positive bus and the negative bus, the inductance of the motor is controlled to be connected with at least one of the negative pole of the power motor, the negative pole of the charging port and the positive bus, and the inductance of the motor is multiplexed to realize at least one mode of a direct fast charging mode, a step-up charging mode and a step-up current charging mode. The motor controller and the motor perform pulse charging and discharging on the power battery, and pulse current is used to realize self-heating of the power battery.

2. The common bus multiplexed motor winding inductance boosting current boosting heating system of claim 1, wherein, The switch assembly comprises first to ninth switches, a resistor, a first capacitor and a second capacitor.

3. The common bus multiplexed motor winding inductance boosting current boosting heating system of claim 1 wherein, The positive bus is provided with a second switch and a sixth switch, the negative bus is provided with a fourth switch and a seventh switch, the positive pole of the power battery is connected with one end of the second switch and one end of the third switch, the other end of the third switch is connected with one end of the resistor, the other end of the second switch is connected with the other end of the resistor, the positive pole of the first capacitor, the positive pole of the second capacitor and one end of the sixth switch, the other end of the sixth switch is connected with the positive pole of the charging port, the negative pole of the power battery is connected with one end of the first switch and one end of the fourth switch, the other end of the first switch is connected with one end of the eighth switch and the negative pole of the second capacitor, the other end of the fourth switch is connected with the negative pole of the first capacitor and one end of the seventh switch, the other end of the seventh switch is connected with the negative pole of the charging port, one end of the fifth switch is connected with one-phase winding inductance of the motor, the other end of the fifth switch is connected with the negative pole of the second capacitor, the other end of the first switch and one end of the ninth switch, and the other end of the ninth switch is connected with the negative pole of the charging port. ​ 4. The common bus multiplexed motor winding inductance boosting current boosting heating system of claim 3, wherein, The second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed, the first switch, the fifth switch, the eighth switch and the ninth switch are opened, the power battery enters a direct current fast charging mode; the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the ninth switch are closed, the first switch, the seventh switch and the eighth switch are opened, the power battery enters a boost charging mode; the first switch, the second switch, the third switch, the fifth switch, the sixth switch and the seventh switch are closed, the fourth switch, the eighth switch and the ninth switch are opened, the power battery enters a boost current charging mode; the second switch, the third switch, the fourth switch and the eighth switch are closed, the first switch, the fifth switch, the sixth switch, the seventh switch and the ninth switch are opened, the power battery enters a battery heating mode.

5. The common bus multiplexed motor winding inductance boosting current boosting heating system of claim 1 wherein, The switch assembly comprises first to ninth switches, a resistor, a first capacitor and a second capacitor, wherein, The positive bus is provided with a second switch and a sixth switch, the negative bus is provided with a fourth switch and a seventh switch, the positive pole of the power battery is connected with one end of the second switch and one end of the third switch respectively, the other end of the third switch is connected with one end of the resistor, the other end of the second switch is connected with the other end of the resistor, one end of the fifth switch and one end of the sixth switch respectively, the other end of the fifth switch is connected with the positive pole of the second capacitor, the other end of the sixth switch is connected with the positive pole of the charging port, the negative pole of the power battery is connected with one phase winding inductance of the motor, one end of the first switch and one end of the fourth switch respectively, the other end of the first switch is connected with one end of the eighth switch, one end of the ninth switch and the negative pole of the second capacitor respectively, the other end of the ninth switch is connected with the negative pole of the charging port, the other end of the fourth switch is connected with the negative pole of the first capacitor and one end of the seventh switch respectively, the other end of the seventh switch is connected with the negative pole of the charging port.

6. The common bus multiplexed motor winding inductance boosting current boosting heating system of claim 5, wherein, The second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed, the first switch, the fifth switch, the eighth switch and the ninth switch are opened, the power battery enters a direct current fast charging mode; the second switch, the third switch, the fourth switch, the sixth switch and the ninth switch are closed, the first switch, the fifth switch, the seventh switch and the eighth switch are opened, the power battery enters a boost charging mode; the first switch, the second switch, the third switch, the fifth switch, the sixth switch and the seventh switch are closed, the fourth switch, the eighth switch and the ninth switch are opened, the power battery enters a boost current charging mode; the second switch, the third switch, the fourth switch and the eighth switch are closed, the first switch, the fifth switch, the sixth switch, the seventh switch and the ninth switch are opened, the power battery enters a battery heating mode.

7. The common positive bus multiplex motor winding inductance boost current heating system according to any one of claims 3-6, one end of the self-heating loop is connected to the middle interface of the power battery, the other end of the self-heating loop is connected to the other end of the first switch, and an eighth switch is arranged on the self-heating loop.

8. The common bus multiplex motor winding inductance boosting current boosting heating system according to any one of claims 3-6, characterized in that, The first to ninth switches are relays.

9. An electric vehicle, characterized by The common positive bus multiplex motor winding inductance boost current heating system according to any one of claims 1-8. The common positive bus multiplex motor winding inductance boost current heating system according to any one of claims 1-8.

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